Abstract

QUINTERO GONZALEZ, Darlin et al. The system of uses of the Rhodic Ferrasol soils modifies the structure and the properties their humic acid. Rev Cie Téc Agr [online]. 2012, vol.21, n.4, pp.55-66. ISSN 2071-0054.

For the study samples of Rhodic Ferrasolsoils  was collected with different uses, low activity anthropic (Artemisa), I cultivate potato-sweet potato (Batabano), cane of sugar (Guira de Melena) and I fallow grass (Nazareno Educational Unit). She took for the analysis the horizon A with a depth 0-20 cm. The samples dried off to the air and they were sifted being used a sieve 2 mm, to subject them later on to the extraction of the humic acid. They were characterized by spectroscopic UV-sense and to FT-GO, as well as the properties acid-base of the humic acid (AH): content of group’s functional acids, and constant of apparent acidity (pKa). The evidences opposing spectroscopic that the systems of use of the floor caused modifications in the structure of the AH that you/they possess that you/they are reflected regarding the functional groups and the condensation level. The properties acid-base evaluated in the AH were affected by the type of applied use, as consequence of the detected structural changes. The capacity buffer, the quantity of group’s functional acids and the relative strength of these presented different values. The humicacid coming from the system of cane of sugar was those that presented the most unfavorable variations that can influence on the functions of it should carry out the matter organic humicacid in the soils.

Keywords : acid-base; apparent acidity; structural changes.

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